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MCQs

Total Questions : 448 | Page 42 of 45 pages
Question 411. . Thermal conductivity of a material may be defined as the
  1.    Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
  2.    Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
  3.    Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 412. . When heat is transferred by molecular collision, it is referred to as heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Scattering
 Discuss Question
Answer: Option B. -> Convection
Question 413. . Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in
  1.    Electric heater
  2.    Boiler
  3.    Steam Condenser
  4.    Refrigerator condenser coils
 Discuss Question
Answer: Option B. -> Boiler
Question 414. . According to Prevost theory of heat exchange
  1.    It is impossible to transfer heat from low temperature source to high temperature source
  2.    Heat transfer by radiation requires no medium
  3.    All bodies above absolute zero emit radiation
  4.    Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
 Discuss Question
Answer: Option C. -> All bodies above absolute zero emit radiation
Question 415. . A grey body is one whose absorptivity
  1.    Varies with temperature
  2.    Varies with wavelength of the incident ray
  3.    Is equal to its emissivity
  4.    Does not vary with temperature and wavelength of the incident ray
 Discuss Question
Answer: Option C. -> Is equal to its emissivity
Question 416. . Thermal diffusivity is
  1.    A dimensionless parameter
  2.    Function of temperature
  3.    Used as mathematical model
  4.    A physical property of the material
 Discuss Question
Answer: Option D. -> A physical property of the material
Question 417. . Sensible heat is the heat required to
  1.    Change vapor into liquid
  2.    Change liquid into vapor
  3.    Increase the temperature of a liquid of vapor
  4.    Convert water into steam and superheat it
 Discuss Question
Answer: Option C. -> Increase the temperature of a liquid of vapor
Question 418. . The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as K1 = 2K2 will be
  1.    1
  2.    0.5
  3.    2
  4.    0.25
 Discuss Question
Answer: Option C. -> 2
Question 419. . The thermal diffusivities for gases are generally
  1.    More than those for liquids
  2.    Less than those for liquids
  3.    More than those for solids
  4.    Dependent on the viscosity
 Discuss Question
Answer: Option A. -> More than those for liquids
Question 420. . Thermal conductivity of wood depends on
  1.    Moisture
  2.    Density
  3.    Temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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